I am used to work with WordPress and some other famous theme.
For the first time :
1) The child theme files were not in the download files!
2) Several people asked you for the files and you replied saying your don t have any link! (you should have a link for your customers)
3) People like me who pay for a theme expect not to spend 3 hours on just finding a way to make a theme child work!
Please for me and for all the future clients, give us a link or copy and past the code for :
function.php and the css file.
PS : looking foward your most simple and fast answer